Zobrazeno 1 - 10
of 223
pro vyhledávání: '"Padmanabhan, Hamsa"'
Autor:
Padmanabhan, Hamsa, Loeb, Abraham
The $James \ Webb \ Space \ Telescope \ (JWST)$ recently reported a large population of UV luminous galaxies at high redshifts, $ z > 10$, as well as Lyman-$\alpha$ emitting (LAE) galaxies out to $z \sim 11$. We use the observed UV luminosities along
Externí odkaz:
http://arxiv.org/abs/2404.18998
Autor:
Padmanabhan, Hamsa, Loeb, Abraham
Publikováno v:
A&A 684, L15 (2024)
We use the recent statistics of dual active galactic nuclei (AGN) in the $James \ Webb \ Space \ Telescope$ (JWST) data at $z \sim 3.4$ to address two aspects of the feedback and evolution scenarios of supermassive black hole binaries (SMBHB). We fin
Externí odkaz:
http://arxiv.org/abs/2401.04161
Autor:
Padmanabhan, Hamsa, Loeb, Abraham
Publikováno v:
ApJL 958 L7 (2023)
We predict the X-ray background (XRB) expected from the population of quasars detected by the JWST spectroscopic surveys over the redshift range $z \sim 4-7$. We find that the measured UV emissivities, in combination with a best-fitting quasar SED te
Externí odkaz:
http://arxiv.org/abs/2310.08633
Autor:
Padmanabhan, Hamsa, Loeb, Abraham
We infer the evolution of the UV luminosities of galaxies in haloes of masses $10^{10} - 10^{11} M_{\odot}$ in the redshift range of $z \sim 9-16$ from the recent JWST data. Within the standard $\Lambda$CDM cosmological model, it is found that the av
Externí odkaz:
http://arxiv.org/abs/2306.04684
The first direct measurements of the HI intensity mapping power spectrum were recently made using the MeerKAT telescope. These measurements are on nonlinear scales, at redshifts 0.32 and 0.44. We develop a formalism for modelling small-scale power in
Externí odkaz:
http://arxiv.org/abs/2305.09720
Autor:
Dunne, Delaney A., Cleary, Kieran A., Breysse, Patrick C., Chung, Dongwoo T., Ihle, Havard T., Bond, J. Richard, Eriksen, Hans Kristian, Gundersen, Joshua Ott, Keating, Laura C., Kim, Junhan, Lunde, Jonas Gahr Sturtzel, Murray, Norman, Padmanabhan, Hamsa, Philip, Liju, Stutzer, Nils-Ole, Tolgay, Doga, Wehus, Ingunn Katherine, Church, Sarah E., Gaier, Todd, Harris, Andrew I., Hobbs, Richard, Lamb, James W., Lawrence, Charles R., Readhead, Anthony C. S., Woody, David P.
We present a new upper limit on the cosmic molecular gas density at $z=2.4-3.4$ obtained using the first year of observations from the CO Mapping Array Project (COMAP). COMAP data cubes are stacked on the 3D positions of 243 quasars selected from the
Externí odkaz:
http://arxiv.org/abs/2304.09832
Autor:
Padmanabhan, Hamsa, Loeb, Abraham
We use the measured scattering timescales of Fast Radio Bursts (FRBs) from the CHIME catalog to derive an upper limit on the magnetic field on sub-kpc scales in the intergalactic medium (IGM). A nonmagnetized, photoionized IGM is insufficient to expl
Externí odkaz:
http://arxiv.org/abs/2301.08259
Autor:
Padmanabhan, Hamsa
We use the latest results from Atacama Large Millimetre/submillimetre Array (ALMA) surveys targeting the ionized carbon [CII] 158 $\mu$m and oxygen [OIII] 88 $\mu$m lines, in combination with data-driven predictions for the evolution of neutral hydro
Externí odkaz:
http://arxiv.org/abs/2212.08077
Autor:
Chung, Dongwoo T., Bangari, Ishika, Breysse, Patrick C., Ihle, Håvard T., Bond, J. Richard, Dunne, Delaney A., Padmanabhan, Hamsa, Philip, Liju, Rennie, Thomas J., Viero, Marco P.
We present the deconvolved distribution estimator (DDE), an extension of the voxel intensity distribution (VID), in the context of future observations proposed as part of the CO Mapping Array Project (COMAP). The DDE exploits the fact that the observ
Externí odkaz:
http://arxiv.org/abs/2210.14890
Autor:
Padmanabhan, Hamsa, Loeb, Abraham
Publikováno v:
A&A 676, A115 (2023)
Galaxy mergers at high redshifts trigger the activity of their central supermassive black holes, eventually also leading to their coalescence -- and a potential source of low-frequency gravitational waves detectable by the SKA Pulsar Timing Array (PT
Externí odkaz:
http://arxiv.org/abs/2207.14309